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Physics
UTME / JAMB 2019
Elasticity, Density, Pressure & Fluids
Solution
Water and Kerosine are drawn respectively into the two limbs of a Hare's apparatus. The destiny of water is 1.0gcm\(^{-3}\) and the density of kerosine is 0.80gcm\(^{-3}\). If the height of the water column is 20.0cm, calculate the height of the kerosine column.
A
1.6cm
B
16.0cm
C
20.0cm
D
25.0cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Devices with different liquids
d\(_1\)h\(_1\) = d\(_2\)h\(_2\)
1 \times 20 = 0.8 \times h
h
=
20
0.8
=
25cm
Source: Myschool Past Questions Archive (Record #55580)
Physics
UTME / JAMB 2019
Reflection, Refraction & Dispersion of Light
Solution
When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl & her image reduces at a speed of
A
2 m/s
B
4 m/s
C
8 m/s
D
12 m/s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The image in a plane mirror is as far behind the mirror as the girl is in front of it.
If she is at a distance d from the mirror, her image is also d behind it.
Total distance between girl and image = 2d.
v = \(\frac{\text{d}}{\text{t}}\) or v ∝ d
d = x, v = 4m/s
d = 2x, v = ? (girl & image)
v = 2 x 4 = 8m/s.
Source: Myschool Past Questions Archive (Record #55582)
Physics
UTME / JAMB 2019
Current Electricity & Electric Circuits
Solution
One newton \times One meter equals?
A
One water
B
One Joule
C
One ampere
D
One kilogram
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
1N \times 1m = 1Nm = 1 Joul (F \times d = Work/Energy)
Source: Myschool Past Questions Archive (Record #55586)
Physics
UTME / JAMB 2019
Magnetism, Electromagnetism & AC Circuits
Solution
The Earth's magnetic equator passes through Jos in Nigeria. At Jos, the
A
angle of variation is zero
B
magnetic declination is 90
C
angle of dip is zero
D
horizontal component at the Earth's field is zero
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
- angle of dip is zero at the magnetic equator
- angle of variation is the same as angle of declination.
Source: Myschool Past Questions Archive (Record #55607)
Physics
UTME / JAMB 2019
Current Electricity & Electric Circuits
Solution
A car moving at 20m/s with its horn blowing (f = 1200Hz) is chasing another car going at 15m/s. What is the apparent frequency of the horn as heard by the driver being chased?
A
1.22KHz
B
2.40KHz
C
8.12KHz
D
1.22Hz
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
f\(_1\)
=
f(v - v\(_o\))
v - v\(_s\)
=
1200(340 - 15)
340 - 20
=
1.22KHz
Source: Myschool Past Questions Archive (Record #55611)
Physics
UTME / JAMB 2019
Waves, Sound & Vibrations
Solution
Any line or section taken through an advancing wave in which all the particles are in the same phase is called the
A
wavelength
B
wave coast
C
wave trough
D
wave front
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Wave front is a line or section taken through an advancing wave in which the particles are in phase.
Source: Myschool Past Questions Archive (Record #55614)
Physics
UTME / JAMB 2019
Current Electricity & Electric Circuits
Solution
In which of the points labelled A, B, C, D and E on the conductor shown would electric charge tend to concentrate most
A
A
B
B
C
C
D
E
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
- Charge are mostly concentrated at the outermost part of a hollow conductor
- Charge are also mostly concentrated at the pointed ends or places with high density point.
Source: Myschool Past Questions Archive (Record #55619)
Physics
UTME / JAMB 2019
Elasticity, Density, Pressure & Fluids
Solution
The point at which the molecules of a loaded wire begin to slide across each other resulting in a rapid increase in extension is
A
yield point
B
proportionality point
C
deformation point
D
elastic point
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
-yield point is where a small increase in load produces a large extention.
Source: Myschool Past Questions Archive (Record #55625)
Physics
UTME / JAMB 2019
Reflection, Refraction & Dispersion of Light
Solution
A microscope is focused on a mark on a table, when the mark is covered by a plate of glass 2m thick, the microscope has to be raised 0.67cm for the mark to be once more in focus. Calculate the refractive index.
A
1.50
B
1.68
C
2.58
D
1.82
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
R = th = 2cm, d = 0.67cm
n
=
R
A
=
R
R.d
=
2
2-0.67
=
1.52
Source: Myschool Past Questions Archive (Record #55587)
Physics
UTME / JAMB 2019
Current Electricity & Electric Circuits
Solution
Radio waves belongs to the class of waves whose velocity is about
A
340m/s
B
3 × 10\(^{6}\) m/s
C
3 × 10\(^{8}\) m/s
D
3 × 10\(^{-8}\) m/s
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
3 \times 10\(^{8}\) m/s
Source: Myschool Past Questions Archive (Record #55589)
Physics
UTME / JAMB 2019
Current Electricity & Electric Circuits
Solution
A single force which produces the same effect as a set of forces acting together at a point is known as the
A
component
B
equilibrant
C
resultant
D
resistant
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Resultant is the representing vector for multiple forces.
Source: Myschool Past Questions Archive (Record #55591)
Physics
UTME / JAMB 2019
Magnetism, Electromagnetism & AC Circuits
Diagram
Solution
Which of the following statement about the electromagnet shown above is correct?
Attached Figure / Diagram
A
when the current flows from A to B, the end A will be in north pole
B
when the current flows from A to B, the end A will be south pole
C
when the current flows from A to B, the end B will be south pole
D
none of the above
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
A - B = S - N.
Also, starting end of the current is south while terminating end is North.
Source: Myschool Past Questions Archive (Record #55594)
Physics
UTME / JAMB 2019
Work, Energy, Power & Simple Machines
Solution
Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm
A
230\(\pi\)
B
23\(\pi\)
C
70\(\pi\)
D
140\(\pi\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
P = 0.2cm, L = r = 23cm
VR
=
2\pir
P
=
2\piL
P
=
2\pi\times23
0.2
=
230\pi
Source: Myschool Past Questions Archive (Record #55597)
Physics
UTME / JAMB 2019
Calorimetry, Latent Heat & Change of State
Solution
The following are some units
I. Ns
II. Non
III. Nm\(^{-2}\)
IV. J^\circK\(^{-1}\)
V. JKg\(^{-1}\)
What are the units of latent heat?
A
I
B
II
C
III
D
V
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Latent heat or specific latent heat = L
Heat
energy
=
mL
or
L
=
H
m
=
energy
mass
Source: Myschool Past Questions Archive (Record #55659)
Physics
UTME / JAMB 2019
Calorimetry, Latent Heat & Change of State
Solution
When two objects A and B are supplied with the same quantity of heat, the temperature change in A is obtained to be twice that of B. The mass of A is half that of B. The ratio of the specific heat capacity of A to B is
A
1 : 4
B
4 : 1
C
1 : 1
D
2 : 1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\thetaA = 2\thet\(a_B\),
m\(_A\)
=
1
2
m\(_B\)
H = MC\theta
m\(_A\)c\(_A\)\theta\(_A\) = m\(_B\)c\(_B\)\theta\(_B\)
( 1/2 m\(_B\))C\(_A\) (2\theta\(_B\)) = m\(_B\)c\(_B\)\theta\(_B\)
C\(_A\)
C\(_B\)
=
1
1
⇒ 1 : 1
Source: Myschool Past Questions Archive (Record #55662)